not on my watch

not on my watch

That will not happen while I am in charge or on the lookout. Calhoun: "Sheriff, those bandits could come back to town any day now. We're all terrified that they're going to rob us again!" Sheriff: "Not on my watch, Calhoun. I'll have those bandits locked up for life if they ever show their faces around here again!"
See also: not, on, watch
Farlex Dictionary of Idioms.
See also:
  • terrify or an animal out of
  • keep a sharp lookout (for something or someone)
  • be on the look out
  • be on the lookout
  • on the lookout
  • be sb's lookout
  • be (one's) (own) lookout
  • lookout
  • from afar